多小区下MIMO OFDM的导频设计和信道估计  

Pilot Design and Channel Estimation in Multi-Cell MIMO OFDM Systems

作　　者：杨宇[1] 康桂霞[1] 吴晓光[1] 张平[1] 

机构地区：[1]泛网无线通信教育部重点实验室(北京邮电大学)

出　　处：《北京邮电大学学报》2008年第1期35-39,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家“863计划”项目(2006AA01Z272;2006AA01Z283);国家自然科学基金项目(60502038);北京市科技新星计划(2007A046);高等学校学科创新引智计划项目(B07005)

摘　　要：为了抑制多入多出正交频分复用(MIMO OFDM)系统小区间信道估计的多址干扰,提出了一种导频设计方案.该方案可以使干扰能量均匀分布在所有信道延时采样点上,使小区间干扰白化.根据该导频的特性,提出了一种改进的频域最小二乘信道估计算法.该算法具有较低计算复杂度,在信道多径延时未知的情况下仍可以有效抑制来自邻小区的干扰,系统性能明显改善.通过仿真证明了导频设计的合理性和信道估计算法的正确性.A pilot aiming at mitigating the inter-ceil interference of channel estimation in multi-input multi-output （MIMO） orthogonal frequency division multiplex （OFDM） systems is designed. The proposed pilot can make the power of interference distribute evenly over all the multi-path delays, so the inter-cell interference is similar to white noise. Based on characteristics of the proposed pilot, an improved frequency domain least squares （LS） channel estimation method is proposed. The algorithm is of low complexity, and is able to mitigate the inter-cell interference effectively even at existing of unknown multi-path delays, therefore, the performance of system will be improved significantly. Simulations validate the pilot design method and the channel estimation algorithm.

关 键 词：多小区 多入多出 正交频分复用 导频设计 信道估计 

分 类 号：TN929.53[电子电信—通信与信息系统]